164468221 has 2 divisors, whose sum is σ = 164468222. Its totient is φ = 164468220.

The previous prime is 164468209. The next prime is 164468263. The reversal of 164468221 is 122864461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156600196 + 7868025 = 12514^2 + 2805^2 .

It is a cyclic number.

It is not a de Polignac number, because 164468221 - 2⁷ = 164468093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164468201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82234110 + 82234111.

It is an arithmetic number, because the mean of its divisors is an integer number (82234111).

Almost surely, 2^164468221 is an apocalyptic number.

It is an amenable number.

164468221 is a deficient number, since it is larger than the sum of its proper divisors (1).

164468221 is an equidigital number, since it uses as much as digits as its factorization.

164468221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 34.

The square root of 164468221 is about 12824.5164041378. The cubic root of 164468221 is about 547.8907877715.

The spelling of 164468221 in words is "one hundred sixty-four million, four hundred sixty-eight thousand, two hundred twenty-one".